Stone to Kilogram
Convert stone (st) to kilogram (kg) instantly. Perfect for parcels, groceries and body weight.
Stone → Kilogram
6.3503
kg
1 st = 6.3503 kg
Frequently asked questions
6.35029 kilograms. A stone is 14 pounds, and it survives in essentially one modern context — British body weight. It is not used in the United States, where body weight is given in plain pounds.
As 11 stones plus 4 pounds, which is (11 × 14) + 4 = 158 lb, or 71.67 kg. It is not 11.4 stone — the second number is a remainder out of fourteen, not a decimal fraction. Reading it as a decimal gives a wrong answer that is small enough here to pass unnoticed and larger in other cases.
Divide by 6.35029 to get decimal stones, then multiply the fractional part by 14 for the pounds. 75 kg is 11.81 stone, and 0.81 × 14 is about 11.4, so roughly 11 stone 11 lb.
One stone is 6.35 kilograms
A stone is 14 pounds, which is 6.35029 kilograms.
Kilograms = stones × 6.35029
Why this unit exists at all
The stone survives in exactly one meaningful modern context: British body weight. It is essentially unused elsewhere, including in the United States, where body weight is given in plain pounds.
For an Indian reader the conversion matters when reading British health content, watching British television, or interpreting weight-loss material written for a UK audience — where someone will describe themselves as "thirteen and a half stone" and the figure means nothing without converting.
The unit was formally prohibited for trade in the UK in 1985 but remains entirely normal in conversation and in medical settings for describing a person's weight.
Reading stones and pounds correctly
British weights are given as stones and pounds, with the pounds running from 0 to 13 before rolling over.
11 stone 4 lb means (11 × 14) + 4 = 158 lb = 71.67 kg.
The critical point: "11 stone 4" is not 11.4 stone. The second number is a remainder out of fourteen, not a decimal fraction. Reading it as a decimal gives 11.4 × 6.35 = 72.4 kg — close enough here to pass unnoticed, and wrong by more in other cases. "11 stone 12" read as 11.12 stone would be badly out.
To convert a decimal stone figure instead: 13.5 stone = 13.5 × 6.35029 = 85.73 kg.
Common values
- 7 st = 44.45 kg
- 8 st = 50.80 kg
- 9 st = 57.15 kg
- 10 st = 63.50 kg
- 11 st = 69.85 kg
- 12 st = 76.20 kg
- 13 st = 82.55 kg
- 14 st = 88.90 kg
- 15 st = 95.25 kg
Converting the other way
To express a metric weight in stones and pounds:
75 kg ÷ 6.35029 = 11.81 stone. The whole part is 11 stone; 0.81 × 14 = 11.4, so about 11 stone 11 lb.
A note on BMI
British health content frequently pairs a weight in stones with a height in feet and inches, and then quotes a BMI. If you are checking that BMI yourself, convert both to metric first — kilograms and metres — rather than attempting the imperial BMI formula, which uses a 703 multiplier and is an additional opportunity for error.
And as noted on the BMI page, South Asian populations have lower recommended thresholds than the WHO standard bands used in most British material, so a BMI described as healthy in a UK source may sit in the overweight range on Asian-Indian cutoffs.